I don't know what that accent is that Winslet is doing but it's not the "Delco Accent" that you'd expect from the area of PA they are supposed to be in.
That disgusting accent makes my head hurt and about 90% of the white people here have it. Saying "wooder" instead of water and shyt.
Only person I have ever seen nail the accent in movies/TV is Bradley Cooper and that's just because he's from the area.
The rest of the accents in Silver Linings Playbook are dreadful. Most Philly accents in movies and TV have been terrible.
The Delco accent is difficult to master because it's a little bit of New York and a little bit of the South.